21311151734 has 4 divisors (see below), whose sum is σ = 31966727604. Its totient is φ = 10655575866.

The previous prime is 21311151733. The next prime is 21311151793. The reversal of 21311151734 is 43715111312.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21311151697 and 21311151706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311151731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5327787932 + ... + 5327787935.

It is an arithmetic number, because the mean of its divisors is an integer number (7991681901).

Almost surely, 2^21311151734 is an apocalyptic number.

21311151734 is a deficient number, since it is larger than the sum of its proper divisors (10655575870).

21311151734 is a wasteful number, since it uses less digits than its factorization.

21311151734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10655575869.

The product of its digits is 2520, while the sum is 29.

The spelling of 21311151734 in words is "twenty-one billion, three hundred eleven million, one hundred fifty-one thousand, seven hundred thirty-four".